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  <title>strstr 函数的忽略大小写版本</title>
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  <div id="layout-content"><div id="function.stristr" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">stristr</h1>
  <p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">stristr</span> &mdash; <span class="dc-title"><span class="function"><a href="strstr.html" class="function">strstr()</a></span> 函数的忽略大小写版本</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.stristr-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>stristr</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
   , <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$needle</code></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$before_needle</code><span class="initializer"> = <strong><code>FALSE</code></strong></span></span>
  ] ) : <span class="type">string</span></div>

  <p class="para rdfs-comment">
   返回 <code class="parameter">haystack</code> 字符串从 <code class="parameter">needle</code> 第一次出现的位置开始到结尾的字符串。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.stristr-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<code class="parameter">haystack</code></dt>

     <dd>

      <p class="para">
       在该字符串中查找。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">needle</code></dt>

     <dd>

      <p class="para">
       如果 <code class="parameter">needle</code> 不是一个字符串，那么它将被转换为整型并被视为字符顺序值。
      </p>
     </dd>

    
    
     <dt>
<code class="parameter">before_needle</code></dt>

     <dd>

      <p class="para">
      若为 <strong><code>TRUE</code></strong>，<span class="function"><a href="strstr.html" class="function">strstr()</a></span> 将返回 <code class="parameter">needle</code> 在 <code class="parameter">haystack</code> 中的位置之前的部分(不包括 needle)。
      </p>
     </dd>

    
   </dl>

  </p>
  <p class="para">
   参数 <code class="parameter">needle</code> 和 <code class="parameter">haystack</code> 将以不区分大小写的方式对待。
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.stristr-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   返回匹配的子字符串。如果 <code class="parameter">needle</code> 未找到，返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 changelog" id="refsect1-function.stristr-changelog">
  <h3 class="title">更新日志</h3>
  <p class="para">
   <table class="doctable informaltable">
    
     <thead>
      <tr>
       <th>版本</th>
       <th>说明</th>
      </tr>

     </thead>

     <tbody class="tbody">
      <tr>
       <td>5.3.0</td>
       <td>
        新增可选的 <code class="parameter">before_needle</code> 参数。
       </td>
      </tr>

      <tr>
       <td>4.3.0</td>
       <td>
        <span class="function"><strong>stristr()</strong></span> 变为二进制安全的。
       </td>
      </tr>

     </tbody>
    
   </table>

  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.stristr-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-5969">
    <p><strong>Example #1 <span class="function"><strong>stristr()</strong></span> 范例</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />&nbsp;&nbsp;$email&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'USER@EXAMPLE.com'</span><span style="color: #007700">;<br />&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'e'</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;输出&nbsp;ER@EXAMPLE.com<br />&nbsp;&nbsp;</span><span style="color: #007700">echo&nbsp;</span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$email</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'e'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">true</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;自&nbsp;PHP&nbsp;5.3.0&nbsp;起，输出&nbsp;US<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
  <p class="para">
   <div class="example" id="example-5970">
    <p><strong>Example #2 测试字符串的存在与否</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />&nbsp;&nbsp;$string&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'Hello&nbsp;World!'</span><span style="color: #007700">;<br />&nbsp;&nbsp;if(</span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'earth'</span><span style="color: #007700">)&nbsp;===&nbsp;</span><span style="color: #0000BB">FALSE</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">'"earth"&nbsp;not&nbsp;found&nbsp;in&nbsp;string'</span><span style="color: #007700">;<br />&nbsp;&nbsp;}<br /></span><span style="color: #FF8000">//&nbsp;输出:&nbsp;"earth"&nbsp;not&nbsp;found&nbsp;in&nbsp;string<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
  <p class="para">
   <div class="example" id="example-5971">
    <p><strong>Example #3 使用非字符串 needle</strong></p>
    <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />&nbsp;&nbsp;$string&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'APPLE'</span><span style="color: #007700">;<br />&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">stristr</span><span style="color: #007700">(</span><span style="color: #0000BB">$string</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">97</span><span style="color: #007700">);&nbsp;</span><span style="color: #FF8000">//&nbsp;97&nbsp;=&nbsp;小写字母&nbsp;a<br />//&nbsp;输出:&nbsp;APPLE<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.stristr-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数可安全用于二进制对象。</span></p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.stristr-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="strstr.html" class="function" rel="rdfs-seeAlso">strstr()</a> - 查找字符串的首次出现</span></li>
    <li class="member"><span class="function"><a href="strrchr.html" class="function" rel="rdfs-seeAlso">strrchr()</a> - 查找指定字符在字符串中的最后一次出现</span></li>
    <li class="member"><span class="function"><a href="stripos.html" class="function" rel="rdfs-seeAlso">stripos()</a> - 查找字符串首次出现的位置（不区分大小写）</span></li>
    <li class="member"><span class="function"><a href="strpbrk.html" class="function" rel="rdfs-seeAlso">strpbrk()</a> - 在字符串中查找一组字符的任何一个字符</span></li>
    <li class="member"><span class="function"><a href="preg_match.html" class="function" rel="rdfs-seeAlso">preg_match()</a> - 执行匹配正则表达式</span></li>
   </ul>
  </p>
 </div>


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